摘 要

废弃水泥浆体在经一定方式处理后能够用来制备一种具有胶结能力的再生胶凝材料，即脱水相。许多科研工作者对其再水化性进行了大量的研究。本文从脱水相粒度对其循环活化性能的影响这方面入手,以孔径为0.075mm、0.15mm的两种砂石筛筛分后废弃水泥浆体粉料为原料，在煅烧温度为550℃、600℃和650℃下制备了脱水相，并研究了粒度对相应温度下热活化处理的脱水相的工作性能和凝结硬化性能的影响，同时也对其水化产物的微观结构和物质组成等进行了研究。

本文的主要研究内容及成果如下：

1.在工作性能上，粒度对脱水相的标稠用水量和凝结时间有较大影响。脱水相粒度较小时，比表面积较大，反应初期与水接触充分，标稠用水量大，凝结时间也相应较短。

2.粒度对脱水相的水化热也有较大影响。粒度越小，水化反应越剧烈，水化放热越多。当煅烧温度为550℃时，两种不同粒度的脱水相的水化反应热均最大。

3.在凝结硬化过程中，粒度为0.075mm筛下样的脱水相与水接触更加充分，水化反应完全，生成的水化产物结构致密，内部孔隙率低，力学强度较好。

4.通过分析XRD衍射图，可知不同粒度的脱水相水化产物的化学化学组成相同，均为Ca(OH)₂和CaCO₃，但含量有所差别。通过观察SEM图像，发现粒度较大时，脱水相水化产物内部孔隙较多，晶体分布不均匀，存在结构缺陷。

5.粒度对二次脱水相的水化产物的影响与其对一次脱水相的作用效果一致。

关键词：脱水相，循环活化，粒度，水化产物

Abstract

The waste cement slurry can be used to prepare a kind of regenerated cementitious material. That is the dehydrated phase. Many researches have been made on the hydration of the dehydrated phase. In this paper, major in the effect of the particle size of the dehydration phase on the cyclic activation performance. The dehydration phase was prepared by using two kinds of sand and gravel sieve with pore size 0.075mm and 0.15mm as raw materials, and the dehydration phase was prepared at the calcination temperature of 550℃, 600℃ and 650℃. The effect of particle size on the properties of the condensate and hardening of the dehydration phase of the heat activation treatment at the corresponding temperature was also studied. At the same time, we study the microstructure and composition of the hydration products. The main research contents and results of this paper are as follows:

1. In the working performance, the particle size has a great influence on the scale of the dehydration phase and the setting time. The size of the dehydrated phase is larger than that of the surface area, and the reaction is in full contact with the water, and the water content of the scale is large. And the setting time is relatively short.

2. Particle size of the dehydration phase of the hydration heat also have a greater impact. The smaller the particle size is, the more hydration reaction of hydration intense. When the calcination temperature is 550℃, the hydration heat of the dehydration phase with two different particle sizes is maximum.

3. In the process of setting and hardening, particle size for 0.075mm screen of dehydrated phases and water contact more fully. And the hydration reaction is fully complete. The hydration product has a compact structure, low internal porosity and good mechanical strength.

4. By the XRD diffraction pattern, we can know that the chemical and chemical composition of the dehydration phase with different particle size is the same as that of Ca (OH) ₂ and CaCO₃, but the content is different. By the SEM images, it is found that the particle size is larger, the internal porosity of the dehydration phase is more. The crystal distribution is not uniform, and there are some defects in the structure.

5.The effect of the particle size on the hydration products of the second dehydration phase is consistent with the effect of the first dehydration phase.

Key Words: dehydrated phase, cyclic activation, particle size, hydration product

目录

第1章 绪 论 1

1.1研究背景及意义 1

1.2国内外研究现状 2

1.3 C-S-H凝胶原理研究 3

1.4 研究内容与方法 4

第2章 实验原料与方法 6

2.1实验原料 6

2.1.1水泥 6

2.1.2脱水相的制备 6

2.2实验仪器 7

2.3实验方法 7

2.3.1标准稠度用水量和凝结时间测试 7

2.3.2力学性能测试 8

2.3.3 孔隙率测试 8

2.3.4水化放热性能测试 8

2.3.5脱水相水化产物组分及微观形貌分析 8

第3章 一次循环脱水相的水化及其性能研究 9

3.1 一次脱水相粒度对其标稠用水量和凝结时间的影响 9

3.2 一次脱水相粒度对其水化放热性能的影响 10

3.3 一次脱水相粒度对其力学性能的影响 11

3.4 一次脱水相粒度对其孔隙率的影响 13

3.5 一次脱水相水化产物XRD分析 14

3.6 一次脱水相水化产物SEM分析 15

3.7 实验小结 16

第4章 二次循环脱水相的水化及其性能研究 17

4.1 二次脱水相粒度对其标稠用水量和凝结时间的影响 17

4.2 二次脱水相粒度对其水化放热性能的影响 18

4.3 二次脱水相粒度对其力学性能的影响 19

4.4 二次脱水相粒度对其孔隙率的影响 20

4.5 二次脱水相水化产物XRD分析 21

4.6 二次脱水相水化产物SEM分析 22

4.7 实验小结 23

第5章 结论与展望 24

5.1结论 24

5.2展望 24

参考文献 25

致谢 27

第1章 绪 论

1.1研究背景及意义

自改革开放以来，我国城市化进程加快，带动了建筑行业在我国的飞速发展，大量新兴建筑出现在城市中，但大规模的建筑施工也遗留下大量的建筑垃圾，不仅污染市容环境，同时也造成建筑资源的巨大浪费。

中国每年因拆除老旧建筑产生的废弃水泥混凝土就多达3400万吨。此外每年新修建建筑将产生4000万吨的建筑垃圾，大规模的基础建设，比如道路、桥梁也将产生大量废弃混凝土^[1]。目前尚无办法使这些废弃混凝土难得到有效的回收利用，同时还需要大量的场地来填埋这些建筑垃圾^[2]，大部分建筑垃圾直接露天存放，对生态环境造成了巨大破坏。我国目前仍处于城市化全面发展的阶段，城市建设还要持续很长一段时间。水泥作为高能耗行业，同时还产生大量建筑垃圾，在资源匮乏的今天，将建筑垃圾直接丢弃是对资源的极大浪费。这与我们建设节约型社会，走可持续发展的道路是相悖的。